Heney davey



(No Model.)

H. DAVEY.

LOW PRESSURE STEAM MOTOR.

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-llNiTED STATES PATENT OFFICE.

HENRY DAVEY, OF LEEDS, COUNTY OF YORK, ENGLAND.

LOW-PRESSURE STEAM-MOTO R.

IPECIEICATIGN forming part of Letters Patent; No. 310,387, dated January 6, 1885.

Application filed July 7, 1884. V(No model.) Patented in England February Q3, 188i, No. 3,533.

To @ZZ whom it may concern:

Be it known that I, HENRY DAVEY, a citizen of England, residing at Leeds, county of York, England, Ahave invented a new or Improved Construction of Low-Pressure Steam- Motor, of which the following is a specification.

My inventionv relates to a cheap and simple construction of steam-motor applicable where small power is required. This motor being worked by steam at a pressure not exceeding that of the atmosphere, the boiler is of a simple character,l requiring no loaded safetyvalve, gages, or appliances for feeding against pressure, and safe from all risk of explosion. rIhe exhaust-steam is condensed, it may be, by surface condensation; but when the greatest simplicity is required it is condensed by injection. i

I will describe the engine, referring to the accompanying drawings.

Figure l is a vertical section through the boiler and cylinder. Fig. 2 is a vertical section through the condenser and air-pump, which are situated at one, side of the boiler; and Fig. 3 is a front view showing the fireplace and cylinder in section.

A is the fire-box within the boiler B,whichl is an upright cast-iron vessel, projecting forward at the bottom to give space for the firebox A and to carry the bearings for the crankshaft C, on which at one side of the boiler is the fly-wheel D. The upper part of the boiler also projects forward, accommodating within it the cylinder E. The piston-rod extends down through the cylinder bottom, and is linked by the connecting-rod F to the crank on the shaft C. From the fire-box A a liuctube, G, extends up through the body of the boiler and its steam-space, and in order to increase the heating-power watcr-tubes H may be xed across the flue.

K is the condenser, which is a vertical tube placed at the side of the boiler, to which it is fixed. At the top it receives the exhauststeam from the cylinder by a branch, L,Which may have a cock or valve, L, as shown, to regulate the speed of.the engine by more or less throttling the exhaust. A pipe, M,` from a cistern a little higher than the water-level in the boiler, supplies an injection branch, I,

opening into the comlensenandafeed branch, N, opening into avertieal tube, U,whichco1n municates with the steam and water spaces of the boiler, as shown in the transverse section, Fig. 4. The feed branch has an opening fitted with a conical plug,` V, which is attached to a float, V. The water in the tube Umaintains the same level as that in the boiler, but is quiescent, and the lioat XV, by raising or lowering the plug V, regulates the feed so as to maintain the water at its proper level.

I is a small air-pump worked by a crankpin on the fly-wheel shaft. This pump draws air, and water from the condenser and discharges the water into a well, from which there is a lateral outlet, Q. Thepump-valves are preferably made, as shown, so that both can be lifted out when required. By a hole, p, water from the well enters the pump to keep the plunger lubricated and sealed against snction of air. The slide S of the cylinder E is worked directly from an eccentric on the ilywheel shaft. Above the cylinder is a light safety-valve, X, which is not intended to be loaded, as the construction of the boiler and the jointing to it of the fire-box and flue are, for the sake of simplicity, done in such a way asnot to be suitedl for high pressure. The cylinder E is preferablymade of gun-metal, so as not to require lubrication of its piston.

Having thus described the nature of myinvention and the best means I know of carrying the same into practical effect, I. claiml. In alow-pressure steam-motor, the combination, with an upright boiler, of a fire-box and iiue placed within said boiler, and a cylinder arranged wholly within the steam-space of the latter, and a condenser connected with the exhaust by a branch having a throttlevalve, substantially as described.

2. In a low-pressure steam-motor, the combination,with the boiler and a cylinder wholly contained within the steam-space thereof, of a condenser connected with the exhaust of the cylinder, a pump worked by a pitman upon the main shaft and drawing water and air from the condenser, and a well having alateral outlet which receives the water, an 'aperture being formed between the well and the plungerchamber for the admission of water to the latter, substantially as described.

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3. In a low-pressure steam-motor, the conibinntion7 with n boiierhnving :t lower projection to receive the iiebox, and un upper projection adapted to receive the cylinder7 of a 5 condenser, K, n Water-supply tube7 U, n feed branch, N, entering the latter, n conical valve,

V, Closing the feed branch, n float, 7, connected to said valve, an injection branch, I, communicating; with the condenser, and :i

o pump withdrmving tho water and air from the latter, substantially ns described.

In testimony `Whereoflhzwe signed my name to this specification, in the presence of two sub4 scribing` Witnesses, this 21st day of June, A. I). 188i.

HENRY DAYEY.

Vitiiesses:

NVILUAM 'Vavns, HENRY S. LENTY, Clerks t0 T. Greenwood T 1de, Solicitor and Notary, Leeds, Enf/Zand. 

